Much of Marxist literature is still taught in universities because it's in fact been such a good analysis of our economic system that it's still relevant to this day
Also, to add as an agreement/slight counter point, I find a lot more of the users here that I would believe as actually educated and insightful about political topics like communism then most other sites, which is a nice change.
It also allows for people to be mind blowing assholes to others, which totally ruins any credibility whatsoever, which i guess ultimately adds to your original statement.
While that is true, it also applies to libertarian capitalists.
Most people don't understand economics. Because economics isn't that sexy to be honest.
And it doesn't help that a lot of the popular economists that one encounters in the mainstream (like Krugman,.Friedman or Mankiw) absolutely and actively engage in disinformation (which they consider education) in the service of their own political biases.
I think Economics Explained is one of the better YouTube channel brining mostly unbiased economics to a mainstream audience.
If you think Economics should only be discussed in print, you might as well buy an Ivory tower and lock yourself up there.
Economics affects people directly through economic policy, so unlike say anthropology or linguistics, people will have strong public opinions and debates on economics.